update directory structure

agents/helpers_fast.py

@@ -0,0 +1,33 @@
+from game_logic.gotypes import Point
+
+
+def is_point_an_eye(board, point, color):
+    if board.get(point) is not None:
+        return False
+    # All adjacent points must contain friendly stones.
+    for neighbor in board.neighbors(point):
+        neighbor_color = board.get(neighbor)
+        if neighbor_color != color:
+            return False
+    # We must control 3 out of 4 corners if the point is in the middle
+    # of the board; on the edge we must control all corners.
+    friendly_corners = 0
+    off_board_corners = 0
+    corners = [
+        Point(point.row - 1, point.col - 1),
+        Point(point.row - 1, point.col + 1),
+        Point(point.row + 1, point.col - 1),
+        Point(point.row + 1, point.col + 1),
+    ]
+    for corner in corners:
+        if board.is_on_grid(corner):
+            corner_color = board.get(corner)
+            if corner_color == color:
+                friendly_corners += 1
+        else:
+            off_board_corners += 1
+    if off_board_corners > 0:
+        # Point is on the edge or corner.
+        return off_board_corners + friendly_corners == 4
+    # Point is in the middle.
+    return friendly_corners >= 3